buildx failed with: ERROR: failed to solve: process "/bin/sh -c wget -q https://github.com/FriendsOfShopware/FroshPluginUploader/releases/download/${PLUGIN_UPLOADER_VERSION}/frosh-plugin-upload.phar -O /opt/bin/plugin-uploader && wget -q https://github.com/humbug/php-scoper/releases/download/${PHP_SCOPER_VERSION}/php-scoper.phar -O /opt/bin/php-scoper && wget -q https://github.com/composer/composer/releases/download/${COMPOSER_VERSION}/composer.phar -O /opt/bin/composer && chmod +x /opt/bin/plugin-uploader /opt/bin/php-scoper /opt/bin/composer && wget -q https://raw.githubusercontent.com/shopware/platform/v6.4.5.1/src/Core/TestBootstrapper.php -O /opt/share/shopware/tests/TestBootstrapperFallback.php" did not complete successfully: exit code: 8